13. 



acute edges; they are rhomboidal in outline, from 1-12 to 1-16 

 of an inch in length. The seeds of the Common pigweed are egg- 

 shaped or lens shaped when viewed from the rim or border ; they 

 are about 1-24 of an inch in length, smooth and shiny. The 

 seed of Goosefoot or Lamb's quarter occur in several forms, us- 

 ually nearly spherical with attached parts of the flower, the 

 calyx showing ribs. They are dull brown in color. Others with 

 a thin membranceous covering. The "seed" is about 1-20 of an 

 inch in diameter, nearly spherical, edges somewhat rounded, sur- 

 face somewhat uneven, jot black in color, sometimes brightly 

 polished. The "seeds" of Chicory are characteristic about 1-10 

 of an inch in length, marked by longitudinal lines and cross 

 lines. The apex with a double row of whitish scales, color dull, 





Fig. 5 Mixture of weed seeds commonly found in low-grade alsike clover 

 seed : a, alsike clover ; b, white clover ; c, red clover ; d, yellow trefoil ; e, 

 Canada thistle ; f, dock ; g, sorrel ; h, buckhorn ; i, rat tail plantain ; fc, lamb's- 

 quarters; I, shepherd's-purse ; in, mayweed; n, scentless camomile; o, white 

 campion; p, night-flowering catch-fly; q, oxeye daisy; r, small-fruited false 

 flax ; s, cinquefoil ; t, two kinds of peppergrass ; u, catnip ; v, timothy ; x, 

 chickweed ; y, Canada bluegrass ; z, clover-dodder ; I, mouse ear ; 2, knot- 



frass ; 8, tumbling amaranth ; -}, rough amaranth ; 5, heal-all ; 6, lady's thumb ;. 

 Enlarged.) (Hillman. U. S. Dept. Agr.) 



very dark, brown to straw color. The seeds of Bachellor's but- 

 ton are oblong or obovoid, compressed or 4-angled, smooth and 

 shining attached obliquely with a disk on top and an elevated 

 margin. These seeds occur in alfalfa. 



The seed of May weed sometimes found in clover is about 1-16 

 of an inch in length, bristly club-shaped, the base wider than 

 apex, prominently ribbed and tubercled. The "seed" of Small 

 Ragweed is 1-16 1-12 of an inch in length, top shaped with 

 prominent projecting teeth, sometimes absent, and a beak. Color 

 dull. Often the outer part missing and then the dark smooth 



